Hybrid Tea rose plant named `Jacosch`

ABSTRACT

A new and distinct variety of rose plant of the Hybrid Tea class, having attractive clear white blooms; long stems; excellent cut flower production; and long vase life.

The present invention relates to a new and distinct variety of roseplant of the hybrid tea class which was originated by me by crossing thevariety ARObipy, U.S. Plant Pat. No. 6,714, with the variety Osiana,U.S. Plant Pat. No. 7,660.

The primary objective of this breeding was to produce a new rose varietyhaving the white flower color of the female parent combined with thelarge flower size and long stems of the male parent. The objective wassubstantially achieved, along with other desirable improvements, asevidenced by the following unique combination of characteristics thatare outstanding in the new variety and that distinguish it from itsparents, as well as from all other varieties of which I am aware:

1. Attractive clear white hybrid tea blooms;

2. Long stems (24-28 inches)

3. Good production (180-190 stems per square meter of greenhouse)

4. Good vase life.

Asexual reproduction of this new variety by budding, as performed atWasco, Calif., shows that the foregoing and all other characteristicsand distinctions come true to form and are established and transmittedthrough succeeding propagations.

The accompanying illustration shows typical specimens of the vegetativegrowth and flowers of this new variety in different stages ofdevelopment, depicted in color as nearly true as it is reasonablypossible to make the same in a color illustration of this character.

The following is a detailed description of my new rose cultivar withcolor descriptions using terminology in accordance with The RoyalHorticultural Society (London) Colour Chart, except where ordinarydictionary significance of color is indicated.

Parentage:

Seed parent.--ARObipy (U.S. Plant Pat. No. 6,714).

Pollen parent.--Osiana (U.S. Plant Pat. No. 7,660).

Classification:

Botanical.--Rosa hybrida.

Commercial.--Hybrid tea.

FLOWER

Observations made from specimens grown in a greenhouse environment atSomis, Calif. from March 1996 to January 1997.

Blooming habit: Recurrent.

Bud:

Size.--2 inches long when the petals start to unfurl.

Form.--The bud form is long, pointed ovoid.

Color.--When sepals first divide, bud color is Green-White Group 157C.When half blown, the upper sides of the petals are White Group 155D; andthe lower sides of the petals are White Group 155D.

Sepals.--Color: Green Group 138B. Surface texture: Covered in finehairs. There are three normally appendaged sepals. There are twounappendaged sepals with hairy edges.

Receptacle.--Color: Green Group 137D. Shape: Apple. Size: Medium(3/8×1/4 inch). Surface: Smooth.

Peduncle.--Length: Medium (21/2 to 3 inches). Surface: Glandular. Color:Medium green. Strength: Stiff, erect.

Bloom:

Size.--Large. Average open size is 41/2 to 5 inches.

Borne.--Singly.

Stems.--Long, strong. Average length is about 24 to 28 inches.

Form.--When first open: High centered Permanence: Retains its form tothe end.

Petalage.--Number of petals under normal conditions: 30 to 35.

Color.--The upper sides of the petals are White Group 155D. The reversesides of the petals are white Group 155D. The base of each petal has avery small (1/8 ×1/8 inch) greenish half-moon at the point ofattachment. The major color on the upper side is White Group 155D.

Variegations.--Occasional greenish white streak on the guard petals.

Discoloration.--No change through the entire life of the flower.

Fragrance.--Moderate.

Petals:

Texture.--Thick.

Shape.--Round.

Form.--Tips slightly recurved, edges slightly quilled.

Arrangement.--Imbricated, with a few petaloids in the center.

Persistence.--Drop off cleanly.

Lastingness.--On the plant: Long (7 days). As a cut flower: Long (10days).

Reproductive parts:

Anthers.--Size: Medium. Quantity: Many. Color: Yellow. Arrangement:Regular around styles.

Filaments.--Color: Yellowish; white with some pink.

Pollen.--Color: Gold yellow.

Styles.--Color: Red.

Stigmas.--Color: Greenish white.

Form: Bush.

Growth: Very vigorous.

Foliage:

Number of leaflets on normal mid-stem leaves.--

Size.--Large (6×41/2 inches).

Quantity.--Normal. Color.--New foliage: Greyed-Orange Group 178C butvery quickly turning green.

Old foliage: Upper surface is Green Group 137A; lower surface is GreenGroup 138B.

Leaflets:

Shape.--Pointed oval.

Texture.--Upper side: Leathery.

Edge.--Serrated.

Serration.--Single.

Petiole rachis.--Color: Reddish when young, then green.

Petiole underside.--Rough, with prickles.

Stipules.--Medium (1/2 inch), serrated, bearded.

Disease resistance.--Resistant to mildew under normal growing conditionsat Somis, Calif. Not tested for rust or blackspot.

Wood:

New wood.--Color: Light green. Bark: Smooth.

Old wood.--Color: Green. Bark: Smooth.

Prickles:

Quantity.--On main canes from base: Ordinary. On laterals from maincanes: Ordinary.

Form.--Medium (3/8 inch), hooked slightly downward.

Color when young.Red.

Small prickles:

Quantity.--On main stalks: None. On laterals: None.

I claim:
 1. A new and distinct variety of rose plant of the Hybrid Teaclass, substantially as herein shown and described, characterizedparticularly as to novelty by the unique combination of its attractiveclear white blooms; long stems; excellent cut flower production; andlong vase life.